2002 Chevy Avalanche 8.1 liter engine
5w30 dino oil first 6000 miles no burn.
Switched to castrol Syntech 5w50--burned 1 qt /300 miles
Switched to 10w30 Castrol Syntech--burned 1 qt /600 miles.
Walmart tech tech 2000 Syn-10w30-burned 1qt/800 miles
Now on oil watch with GM with 5w30 Dino again--so far in 1000 miles no burn--what gives??
The engine now has 16000 miles on it and it appears that Synthetic oil and this engine don't mix??
Yes, there is piston slap and my neighbour thinks I have a diesel for the first 1 minute of ops--the same for all the oils tried --no appearent difference.
Any ideas--should we try 15w40 mobil in temps above 0 deg C ??Would like to use a synthetic oil as it must be better over a greater operating range of temps and trailer towing.
Clare
5w30 dino oil first 6000 miles no burn.
Switched to castrol Syntech 5w50--burned 1 qt /300 miles
Switched to 10w30 Castrol Syntech--burned 1 qt /600 miles.
Walmart tech tech 2000 Syn-10w30-burned 1qt/800 miles
Now on oil watch with GM with 5w30 Dino again--so far in 1000 miles no burn--what gives??
The engine now has 16000 miles on it and it appears that Synthetic oil and this engine don't mix??
Yes, there is piston slap and my neighbour thinks I have a diesel for the first 1 minute of ops--the same for all the oils tried --no appearent difference.
Any ideas--should we try 15w40 mobil in temps above 0 deg C ??Would like to use a synthetic oil as it must be better over a greater operating range of temps and trailer towing.
Clare